Japan Geoscience Union Meeting 2015

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Oral

Symbol H (Human Geosciences) » H-SC Social Earth Sciences & Civil/Urban System Sciences

[H-SC24] Human environment and disaster risk

Sun. May 24, 2015 4:15 PM - 6:00 PM 101B (1F)

Convener:*Tatsuto Aoki(School of Regional Development Studies, Kanazawa University), Yasuhiro Suzuki(Nagoya University), Mamoru Koarai(Survey Department, College of Land, Infrastructure, Transport and Tourism), Toshihiko Sugai(Department of Natural Environmental Studies, Institute of Environmental Studies, Graduate School of Frontier Science, The University of Tokyo), Hiroshi Une(Geospacial Information Authority of Japan), Yoichi Nakamura(Department of Earth Sciences, Utsunomiya University), Jun Matsumoto(Deaprtment of Geography, Tokyo Metropolitan University), Shintaro Goto(Department of Environmental Systems Faculty of GEO-Environmental Science Rissho University), Keitarou Hara(Faculty of Informatics, Tokyo University of Information Sciences), Chair:Tatsuto Aoki(School of Regional Development Studies, Kanazawa University)

5:30 PM - 5:33 PM

[HSC24-P01] Background of shallow landslides triggered by the 1971 torrential rain in the village of Kawauchi, Fukushima Prefect

3-min talk in an oral session

*Hiromu DAIMARU1, Wataru MURAKAMI1, Hitoshi SAITO2 (1.Forestry and Forest Products Research Institute, 2.Kanto Gakuin University)

Keywords:shallow landslide, natural disaster, deforestation, communal forest

Many shallow landslides were triggered by torrential rain on 31 August and 1 September in 1971, which reached to 571mm at the Shimo-kawauchi Met. Station. Most of the landslides have occurred on slope of the valleys cutting into the low-relief granitic mountains that received deep weathering. Mountain forest cover at the period is estimated to be rather sparse than present time. A digital photogrammetric survey has suggested that tree height at 1975 was smaller than half of that in present time which was estimated from air bone LiDAR data in this area. Some previous studies have suggested that forest vegetation in this area was seriously destroyed by migrants after the restitution of communal forest in 1912. The 1971 shallow landslides were affected by not only brittle granitic soils, but also past excess forest utilization.